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The Millboard composite decking was still perfect in every way after 7-8 years. The joists Use Class III treated, fixed with stainless fixings and kept off the floor still suffered rotting.
The joists simply crumbled upon inspection. The likely cause was that that whilst sufficient gaps were left between boards they had clogged up and stopped the air from circulating.
The decking boards were lifted, joists and posts replaced and decking boards refitted.
High end or not to high end…
The steel platform was a perfect example of how to design and fabricate a raised walkway platform. The problems here are that someone though that if they used over thickness IPE hardwood decking they would only fix it on one side of the board… “Its rock solid this”… “This ain’t going nowhere”… “But is 36mm thick, how can it possible move” were possible some of the comments. Then nature got in the way and does what it always does to timber fitted outside… it moved and not a lot will prevent this, except a proper design that considers the property of the timber and how it is mechanically fixed to the correctly specified substructure…
This project was a very expensive mistake and had to be removed and replaced with more expensive timber and this time fitted correctly…
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